[Request]: add interface to bind to for networks, multiple networks

### Feature or enhancement request details

I have a use case where I need to bind a container to eth0 and eth8 which is trivial in docker.

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

Issue #1283 describes binding a container to eth0 and eth8, comparing the use case to Docker, but names no files, tests, or entry points. Start by locating the container networking configuration and clarifying the expected interface for multiple networks; done should be defined by successful binding to both requested interfaces.

Written by the indexing model from the issue text.